Motorized power assisting device

Abstract

The present invention provides a motorized power assisting device capable of delivering various desired brake characteristics and improving brake feeling by controlling displacement according to the absolute displacement of an input member so as to make variable the relative displacement relations between the input member and an assist member. A target displacement that makes variable the relative displacement relations between an input piston and a booster piston is set according to a detection signal by a potentiometer (86) (an input absolute displacement detecting means), and a displacement is controlled based on a signal from a relative displacement sensor (100) that detects the relative displacement between the both pistons so that the relative displacement between the both pistons agrees with the target displacement. Controlling the relative displacement between the input piston and the booster piston in this way can deliver various brake characteristics such as brake assist control.

Description

electric booster technical field The invention relates to an electric power booster used in a brake mechanism of an automobile and the like. Background technique Conventionally, there is an electric power booster that uses an electric driver to boost a pedal input and output it to a master cylinder. Examples of such electric boosters include those disclosed in Patent Documents 1 to 3. The electric power booster disclosed in Patent Document 1 includes a power booster (electromagnetic device) provided to boost the transmission force generated by the input rod to the master cylinder, and a relative displacement sensor that detects the relative displacement between the input rod and the power booster. , to control the displacement of the power-assisted component so that the input rod and the power-assisted component are displaced integrally, that is, to make the relative displacement detected by the relative displacement sensor be zero. The electric power booster disclosed...

AI Technical Summary

Problems solved by technology

Although the device disclosed in Patent Document 3 can make the relative displacement of the input part and the power-assisted part, it does not consider detecting the relative displacement of the two parts at all. Therefore, the relative displacement relationship between the input part and the power-assisted part cannot be variably controlled.

The device disclosed in Patent Document 3 does not detect the absolute displacement of the input member, and does not include a technology for freely controlling the displacement of the relative displacement relationship between the two components based on the absolute displacement.

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